Air-gap manifold

Abstract

An air-gap manifold for the connection of exhaust gas outlet openings of an internal combustion engine, in particular of a motor vehicle engine, to an exhaust gas intake opening of an exhaust gas system, having an interior part with a plurality of exhaust gas guides plugged into one another with a sliding fit, an exterior part surrounding the interior part and made gas-tight and an air-gap present between the interior part and the exterior part, wherein at least some of the exhaust gas guides of the interior part are formed by shells which are connected to one another by common reshaping at the rim, in particular by folding, in order to reduce the manufacturing costs.

1 . An air-gap manifold for the connection of exhaust gas outlet openings of an internal combustion engine, in particular of a motor vehicle engine, to an exhaust gas intake opening of an exhaust gas system, having an interior part ( 1 ) with a plurality of exhaust gas guides ( 2 ,  3 ,  4 ) plugged into one another with a sliding fit, an exterior part ( 5 ) surrounding the inner part ( 1 ) and made gas-tight and an air-gap ( 6 ) present between the interior part ( 1 ) and the exterior part ( 5 ), characterized in that 
 at least some of the exhaust gas guides ( 2 ,  3 ,  4 ) of the interior part ( 1 ) are formed by shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) which are connected to one another by common reshaping at the rim, in particular by folding.    
   
   
       2 . An air-gap manifold in accordance with  claim 1 , characterized in that the exterior part ( 5 ) likewise consists of shells ( 5   a ,  5   b ).  
   
   
       3 . An air-gap manifold in accordance with  claim 1 , characterized in that the shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the interior part ( 1 ) and/or the shells ( 5   a ,  5   b ) of the exterior part ( 5 ) consist of sheet metal.  
   
   
       4 . An air-gap manifold in accordance with  claim 1 , characterized in that the shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the interior part ( 1 ) and/or the shells ( 5   a ,  5   b ) of the exterior part ( 5 ) have beads ( 19 ).  
   
   
       5 . An air-gap manifold in accordance with  claim 3 , characterized in that the shells ( 5   a ,  5   b ) of the exterior part ( 5 ) are welded to one another.  
   
   
       6 . An air-gap manifold in accordance with  claim 1 , characterized in that the shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the interior part are latched to one another, in particular by individual spot welds.  
   
   
       7 . An air-gap manifold in accordance with  claim 1 , characterized in that the exterior part ( 5 ) consists of two half-shells ( 5   a ,  5   b ).  
   
   
       8 . An air-gap manifold in accordance with  claim 1 , characterized in that the shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the interior part ( 1 ) are half-shells.  
   
   
       9 . An air-gap manifold in accordance with  claim 8 , characterized in that the separation plane (I) of the exterior shell ( 5 ) and the separation plane (II) of the interior shell ( 1 ) stand approximately at right angles to one another.  
   
   
       10 . An air-gap manifold in accordance with  claim 1 , characterized by the use for an internal combustion engine with a turbocharger.  
   
   
       11 . A method for the manufacture of an air-gap manifold for the connection of exhaust gas outlet openings of an internal combustion engine, in particular of a motor vehicle engine, to an exhaust gas intake opening of an exhaust gas system, the air gap manifold having an interior terior part ( 1 ) with a plurality of exhaust gas guides ( 2 ,  3 ,  4 ) plugged into one another with a sliding fit, an exterior part ( 5 ) surrounding the inner part ( 1 ) and made gas-tight and an air-gap ( 6 ) present between the interior part ( 1 ) and the exterior part ( 5 ), wherein at least some of the exhaust gas guides ( 2 ,  3 ,  4 ) of the interior part ( 1 ) are formed by shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) which are connected to one another by common reshaping at the rim, in particular by folding. characterized in that 
 the shells ( 2   a ,  3   a ,  4   a ) of the interior part ( 1 ) each forming one part of the exhaust gas guides ( 2 ,  3 ,  4 ) are first plugged into one another in accordance with the desired sliding fit arrangement, the shells ( 2   b ,  3   b ,  4   b ) each forming the other part of the exhaust gas guides ( 2 ,  3 ,  4 ) are then likewise plugged into one another in accordance with the desired sliding fit arrangement; and in that only then are the associated shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the exhaust gas guides ( 2 ,  3 ,  4 ) jointly connected to one another in that they are reshaped at the rim in pairs, in particular folded.    
   
   
       12 . A method in accordance with  claim 11 , characterized in that the shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the interior part ( 1 ) are latched to one another by individual spot welds.  
   
   
       13 . A method in accordance with  claim 11 , characterized in that the shells ( 5   a ,  5   b ) of the exterior part ( 5 ) are welded to one another in a gas tight manner.  
   
   
       14 . A method in accordance with  claim 11 , characterized in that the shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the interior part ( 1 ) and/or the shells ( 5   a ,  5   b ) of the exterior part ( 5 ) consist of sheet metal.  
   
   
       15 . A method in accordance with  claim 11 , characterized in that the shells ( 2   a ,  2   b ,  3   a ,  3   b ,  4   a ,  4   b ) of the interior part ( 1 ) and/or the shells ( 5   a ,  5   b ) of the exterior part ( 5 ) are provided with beads.